An object is placed 15 cm in front of a convex lens with a focal length of 10 cm. Find the image distance and describe the nature of the formed image.
Answer and explanation
Correct answer: C. 30 cm, real and inverted
- Step 1: Thin lens formula: 1/f = 1/u + 1/v => 1/10 = 1/15 + 1/v. Step 2. 1/v = 1/10 - 1/15 = (3 - 2)/30 = 1/30 => v = +30 cm. Step 3. Since v > 0, the image is real and inverted. Answer: 30 cm, real and inverted. Why not the others: Real images formed by convex lenses are inverted; virtual images have negative image distances.
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